Wasn't scared at first... Now I am?

I brought home a sling a couple weeks ago. Rehousing was rough. It escaped but we got it figured out and everyone was fine. Then I brought home a juvie (about 3in). While rehousing s/he attacked the paintbrush. I've successfully fed and cared for both, enjoy watching them take prey, web up, etc. At the same time, even just looking at them makes my heart go into my throat a little bit. I'm not sure if I just need time to adapt or what. I was so psyched in the beginning but the attacking, escaping, and speed (they're both new worlds but still just quicker than I expected) has really made me question if I can do this. I mean, I know I can, like I would never neglect them but it's making me wonder like, will it get easier? Or should I just throw in the towel? I was not expecting this at all. Please don't be too hard on me, I already feel kinda foolish and am being hard on myself about this.